Abstract
Two different sets of type-II core/shell semiconductor nanocrystals (NCs) are prepared and studied by optical absorption, time-resolved and time-integrated photoluminescence (PL) spectroscopy, as well as cyclic voltammetry (CV). In particular, NCs with a CdTe core and a CdSe shell of variable thickness, where the holes are localized in the core and the electrons are mainly in the shell, are compared with their inverse system of a CdSe core and a CdTe shell. All measurements are correlated to model calculations based on the effective mass approximation (EMA). The comprehensive study reveals a good congruence between optical and electrochemical measurements and theoretical modeling. In particular, we find a good coincidence between the shell-thickness dependence of the band gap as measured in PL experiments, as determined from CV data, and as calculated. Interestingly, the cyclic voltammograms, which also allow for the determination of absolute electronic energy levels, are rich in features: for various she...
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